The steam volatile compounds among the following are: Choose the correct answer from the options given below:

### Related Formula textIntramolecular H-bonding implies textLower boiling point implies textSteam Volatile$$\text{Intramolecular H-bonding} \implies \text{Lower boiling point} \implies \text{Steam Volatile}$$ ### Core Logic Purification via steam distillation requires a high relative vapor pressure at the boiling point of water. Let us assess the isomers : * (A) o-Nitrophenol contains an -mathrmOH$-\mathrm{OH}$ group right next to an -mathrmNO_2$-\mathrm{NO}_2$ group, allowing for strong intramolecular hydrogen bonding. This minimizes external interactions, lowering the boiling point and making it steam volatile . * (B) o-Nitroaniline similarly stabilizes itself via internal intramolecular hydrogen bonding between the amine and nitro components, making it steam volatile . * (C) & (D) The para isomers form extensive intermolecular networks with neighboring molecules, which significantly elevates their boiling points and prevents steam volatility .

Hence, compounds (A) and (B) are steam volatile, matching option (3). ### Pattern Recognition ortho-substituted functional networks form self-contained internal loops through hydrogen bonding, preventing external pairing and maximizing volatility. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Chemistry: Organic Chemistry - Some Basic Principles and Techniques Class 11 Chemistry: Chemical Bonding and Molecular Structure